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Automotix DIY provides automotive consumers and do it yourselfers; the most comprehensive repair information about 1991 GMC Sonoma car and truck
repair procedures including GMC engine diagrams, wiring diagrams, repair work estimating measures, technical service bulletins, auto body work
guidance, starter & alternator replacement procedures, serpentine belt replacement procedures, radiator & hose replacement procedures, tune-up &
drivability specifications, quick lube illustrations, preventive maintenance guide, engine light reset instructions, parts removal and install
procedures, fuel filter replacement directions, component location diagrams, air filter locations & replacement instructions, a/c
system specifications, and general auto service procedures. You don't have to be a car mechanic or technician to know how to fix
your 1991 GMC Sonoma automobile. Try the Automotix DIY solution today!
We have info for following modifications of 1991 GMC Sonoma
- 1991 GMC Sonoma 2.5 L4 GAS, CC:2474, CID:151, Fuel Injection, Aspiration:151, Engine VIN:, Desg:E
- 1991 GMC Sonoma 4.3 V6 GAS, CID:262, Fuel Injection, Aspiration:262, Engine VIN:, Desg:Z
- 1991 GMC Sonoma 2.8 V6 GAS, CID:173, Fuel Injection, Aspiration:173, Engine VIN:, Desg:R
- 1991 GMC Sonoma 2.5 L4 GAS, CC:2474, CID:151, Fuel Injection, Aspiration:151, Engine VIN:, Desg:A
BRAKE SERVICE PROCEDURES FOR 1991 GMC Sonoma AUTOMOBILES
Includes anti-lock brakes, disc, drum, power and hydraulic brake services diagnostics and procedures for domestic and imported 1991 GMC Sonoma cars and light trucks from 1990+.
ANTI-LOCK BRAKES, GENERAL MOTORS -> Rear Wheel Anti-Lock Brake System -> DIAGNOSIS & TESTING -> DIAGNOSTIC CHARTS -> DIAGNOSTIC CIRCUIT CHECK -> READING TROUBLE CODES -> WIRING DIAGRAMS
Vehicle: 1991 GMC Sonoma 2.5 L4 GAS
WIRING DIAGRAMS
Refer to "Wiring Diagrams" in "Vehicle Systems."
READING TROUBLE CODES
Trouble codes are accessed by connecting a jumper wire between terminals A and H of the underdash ALDL connector and observing the flashes of the brake warning lamp. Note the following when performing the Diagnostic Circuit Check to access trouble codes.
- When the terminals are jumped, count the number of short flashes starting from the initial long flash and including the long flash in the count.
- The count sequence will repeat as long as the ALDL connector terminals are jumped with the ignition on.
- ...
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BRAKE SERVICE PROCEDURES FOR 1991 GMC Sonoma AUTOMOBILES
Includes anti-lock brakes, disc, drum, power and hydraulic brake services diagnostics and procedures for domestic and imported 1991 GMC Sonoma cars and light trucks from 1990+.
DISC BRAKES, GENERAL MOTORS -> Delco-Moraine Single Piston Caliper -> BRAKE PAD, Replace -> INSTALLATION -> REMOVAL
Vehicle: 1991 GMC Sonoma 4.3 V6 GAS
REMOVAL
- Remove caliper assembly as outlined above.
- Remove inboard pad with retainer spring. Dislodge outboard pad and position caliper on the front suspension so the brake hose will not support the weight of the caliper.
- Remove two sleeves from inboard ears of the caliper.
- Remove four rubber bushings from the grooves in each of the caliper ears.
INSTALLATION
- Lubricate new sleeves, rubber bushings, bushing grooves and mounting bolt ends with Delco Silicone Lube or equivalent.
- Install new bushings and sleeves in caliper ears. Position the sleeve so that the end toward the pad is flush...
CLICK HERE TO GET FULL ACCESS TO 1991 GMC Sonoma BRAKE SERVICE PROCEDURES
BRAKE SERVICE PROCEDURES FOR 1991 GMC Sonoma AUTOMOBILES
Includes anti-lock brakes, disc, drum, power and hydraulic brake services diagnostics and procedures for domestic and imported 1991 GMC Sonoma cars and light trucks from 1990+.
DRUM BRAKES, GENERAL MOTORS -> General Information -> GENERAL INSPECTION -> ADJUSTER MECHANISM -> BACKING PLATE -> BRAKE DRUMS -> BRAKE LININGS & SPRINGS -> PARKING BRAKE CABLE
Vehicle: 1991 GMC Sonoma 2.8 V6 GAS
BRAKE DRUMS
Any time the brake drums are removed for brake service, the braking surface diameter should be checked with a suitable brake drum micrometer at several points to determine if they are within the safe oversize limit stamped on the brake drum outer surface. If the braking surface diameter exceeds specifications, the drum must be replaced. If the braking surface diameter is within specifications, drums should be cleaned and inspected for cracks, scores, deep grooves, taper, out of round and heat spotting. If drums are cracked or heat spotted, they must be replaced. Gr...
CLICK HERE TO GET FULL ACCESS TO 1991 GMC Sonoma BRAKE SERVICE PROCEDURES
BRAKE SERVICE PROCEDURES FOR 1991 GMC Sonoma AUTOMOBILES
Includes anti-lock brakes, disc, drum, power and hydraulic brake services diagnostics and procedures for domestic and imported 1991 GMC Sonoma cars and light trucks from 1990+.
DISC BRAKES, GENERAL MOTORS -> Bendix Single Piston Sliding Caliper -> BRAKE PADS, Replace
Vehicle: 1991 GMC Sonoma 2.5 L4 GAS
The procedures to remove & install the brake pads are outlined under "Caliper Service," "Remova... "
CLICK HERE TO GET FULL ACCESS TO 1991 GMC Sonoma BRAKE SERVICE PROCEDURES
BRAKE SERVICE PROCEDURES FOR 1991 GMC Sonoma AUTOMOBILES
Includes anti-lock brakes, disc, drum, power and hydraulic brake services diagnostics and procedures for domestic and imported 1991 GMC Sonoma cars and light trucks from 1990+.
POWER BRAKE UNITS, GENERAL MOTORS -> General Service -> DESCRIPTION
Vehicle: 1991 GMC Sonoma 4.3 V6 GAS
In order to properly service power brake systems, a thorough understanding of the various power assist systems is necessary. These systems provide a mechanical assist, acting to increase the force applied to the master cylinder piston by the driver while decreasing the effort necessary to obtain acceptable stopping performance. Two basic types of power assist mechanisms are used: vacuum assist diaphragm assemblies which use engine vacuum and in some cases vacuum from an external vacuum pump, and hydraulic assist assemblies which use hydraulic pressure developed by an external pump (...
CLICK HERE TO GET FULL ACCESS TO 1991 GMC Sonoma BRAKE SERVICE PROCEDURES
BRAKE SERVICE PROCEDURES FOR 1991 GMC Sonoma AUTOMOBILES
Includes anti-lock brakes, disc, drum, power and hydraulic brake services diagnostics and procedures for domestic and imported 1991 GMC Sonoma cars and light trucks from 1990+.
ANTI-LOCK BRAKES, GENERAL MOTORS -> Four Wheel Anti-Lock Brake System -> COMPONENT REPLACEMENT -> EHCU MODULE -> FRONT WHEEL SPEED SENSOR -> REAR WHEEL SPEED SENSOR
Vehicle: 1991 GMC Sonoma 2.5 L4 GAS
EHCU MODULE
The EHCU module is not serviceable and must be replaced as a unit. Refer to Fig. when replacing the unit.
- Bleed brake booster by depressing brake pedal several times.
- Remove washer tank attaching bolts, then position aside.
- Remove EHCU electrical connectors.
- Disconnect module brake lines. Use caution not to get brake fluid on paint or electrical connections.
- Remove upper to lower bracket assembly attaching bolts.
- Remove EHCU module and upper bracket assembly from vehicle.
- Remove upper mounting bracket to EHCU module attaching bolts.
- Reverse procedure to install, noting...
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